EP3813405A1 - Communication dans un spectre sans licence - Google Patents

Communication dans un spectre sans licence Download PDF

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Publication number
EP3813405A1
EP3813405A1 EP20215098.3A EP20215098A EP3813405A1 EP 3813405 A1 EP3813405 A1 EP 3813405A1 EP 20215098 A EP20215098 A EP 20215098A EP 3813405 A1 EP3813405 A1 EP 3813405A1
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Prior art keywords
channel
lte
wireless access
access network
unlicensed spectrum
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EP20215098.3A
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German (de)
English (en)
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EP3813405B1 (fr
EP3813405C0 (fr
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Takashi Suzuki
Eswar Vutukuri
Zhijun Cai
Werner Kreuzer
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Malikie Innovations Ltd
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BlackBerry Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the unlicensed spectrum includes frequencies that are in addition to frequencies within a licensed spectrum that are available to a respective wireless access service provider.
  • a mobile communications network can operate according to one of various different types of standards.
  • a mobile communications network can operate according to the Long-Term Evolution (LTE) standards as provided by the Third Generation Partnership Project (3GPP).
  • LTE Long-Term Evolution
  • 3GPP Third Generation Partnership Project
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • LAA Licensed Assisted Access
  • An unlicensed spectrum includes frequencies that are not part of the licensed spectrum for a given mobile communications network.
  • LTE can be associated with a specific licensed spectrum that includes frequencies over which LTE communications can occur.
  • An unlicensed spectrum includes frequencies outside the LTE licensed spectrum, e.g. frequencies currently used by Wi-Fi.
  • LAA for an LTE access or network can also be referred to as LTE-U (Long-Term Evolution in unlicensed spectrum).
  • Figs. 1A-1D illustrates examples of Licensed-Assisted Carrier Aggregation arrangements, in which use of the unlicensed spectrum is in the context of a Carrier Aggregation framework.
  • Carrier Aggregation is a feature that allows two or more component carriers (CCs) to be simultaneously used by a wireless access network node to send data to or receive data from the same UE.
  • LTE currently allows carrier aggregation for up to five component carriers at the same time.
  • other CA arrangements with different numbers of component carriers can be provided.
  • Licensed-Assisted CA operation employs a carrier in the unlicensed spectrum as being one of the component carriers for CA.
  • Fig. 1A shows communications with a UE 102 using three different component carriers: a first component carrier 104 for uplink (UL) communications from the UE 102 to a wireless access network node, a second component carrier 106 for downlink (DL) communications from the wireless access network node to the UE 102, and a third component carrier 108 that is in the unlicensed spectrum for DL communications with the UE 102.
  • UL uplink
  • DL downlink
  • a wireless access network node can be implemented as an enhanced Node B (eNB), which includes functionalities of a base station and base station controller.
  • eNB enhanced Node B
  • eNBs include functionalities of a base station and base station controller.
  • the first and second component carriers 104 and 106 in Fig. 1A are part of the LTE licensed spectrum.
  • Fig. 1A shows an example of frequency division duplex (FDD) communications in the licensed spectrum, where the uplink and downlink communications are provided over separate frequencies.
  • FDD frequency division duplex
  • the arrangement of Fig. 1A can be referred to as a Supplementary Downlink only (SDL) arrangement.
  • the component carriers 104, 106, and 108 can form a CA. Note that additional component carriers from the licensed spectrum and/or the unlicensed spectrum can be part of the CA.
  • Fig. 1B shows an alternative example arrangement of an SDL arrangement in which time division duplex (TDD) communications is performed in the licensed spectrum, where uplink and downlink communications can occur over a common component carrier 110 but in different time periods.
  • TDD time division duplex
  • the component carrier 108 in the unlicensed spectrum can also be used for only DL communications.
  • cells provided on carriers in the unlicensed spectrum can be used to support both UL and DL communications, as depicted in each of Figs. 1C and 1D .
  • Such an arrangement is referred to as a Supplementary UL/DL carrier in TDD arrangement.
  • FDD communications is provided in the licensed spectrum using component carriers 104 and 106, and TDD communications (UL and DL communications in different time periods) can be performed using a component carrier 112.
  • TDD communications is performed in the licensed spectrum using the component carrier 110, while TDD communications is also performed in the unlicensed spectrum using the component carrier 112.
  • carriers of an unlicensed spectrum can be used in other arrangements, such as in a Licensed-Assisted Dual connectivity arrangement (where a UE has a dual connection to a carrier in the licensed spectrum and a carrier in the unlicensed spectrum) or a standalone arrangement (in which the UE communicates just over a carrier in the unlicensed spectrum, with no association with a carrier in the licensed spectrum) or an arrangement where FDD is used both in the licensed spectrum and an unlicensed spectrum.
  • a Licensed-Assisted Dual connectivity arrangement where a UE has a dual connection to a carrier in the licensed spectrum and a carrier in the unlicensed spectrum
  • a standalone arrangement in which the UE communicates just over a carrier in the unlicensed spectrum, with no association with a carrier in the licensed spectrum
  • FDD Frequency Division Duplex
  • signaling related to UE access of a wireless access network, UE mobility, and other control messages can be communicated over the primary (licensed) carrier (in the licensed spectrum).
  • the secondary carrier in the unlicensed spectrum
  • the secondary carrier can be used for opportunistic increase of throughput for data communications between an eNB and a UE (in the DL direction only, or in both the DL and UL directions).
  • One or more cells can be provided on a given component carrier, either in the licensed or unlicensed spectrum.
  • a "cell” can refer generally to a coverage area provided by a wireless access network node on the respective component carrier.
  • a primary cell, or PCell can be configured on a component carrier in the licensed spectrum
  • a secondary cell, or SCell can be configured on each of the other one or more component carriers of the CA, where an SCell can be configured on a component carrier in either the licensed or unlicensed spectrum.
  • the PCell is used to communicate certain control information in addition to the data traffic to UEs served by the PCell, while an SCell is used to communicate data traffic and certain control information related to the data traffic.
  • Data traffic can refer to bearer data, which can include user data (e.g. voice data or other data communicated by a user), application data, and so forth.
  • LTE-U targets fair sharing of channel resources such as the carrier frequencies in an unlicensed spectrum with incumbent systems (e.g. Wi-Fi systems) operating in the same unlicensed bands.
  • An incumbent system refers to a system that normally uses carriers of the unlicensed spectrum.
  • the features enabling this fair sharing should be frequency band and region agnostic.
  • a primary use entity is an entity that uses specific frequency band(s) of the unlicensed spectrum, and is to be given priority for use of such specific frequency band(s), according to government regulation or other arrangement.
  • An example of a primary use entity is an entity that performs radio detection and ranging (Radar), which includes using radio signals to determine the range, altitude, direction, or speed of objects, such as aircraft, spacecraft, motor vehicles, weather formations, and so forth.
  • Radar radio detection and ranging
  • DFS Dynamic Frequency Selection
  • TPC Transmit Power Control
  • Another example of a primary use entity is an entity that transmits TV signals.
  • frequencies seen as vacant or having low interference by an LTE-U eNB may not be seen as vacant or having low interference by some of the UEs in the coverage of the LTE-U eNB.
  • An LTE-U eNB refers to an eNB that is capable of LTE-U or LAA operation.
  • Fig. 2 shows a coverage area 202 of the LTE-U eNB, and respective coverage areas 204 and 206 of corresponding access points AP1 and AP2, which can be WLAN APs that operate according to IEEE 802.11, for example.
  • Each of UE1, UE2, and UE3 is in the coverage area 202 of the LTE-U eNB, while UE1 is also in the coverage area 204 of AP1 and UE3 is in the coverage area of AP2. It is assumed that the LTE-U eNB and AP1 use channel X, while AP2 uses channel Y.
  • a "channel" can refer to a specific frequency used by the respective node to perform communications. Since UE2 is just in the coverage area 202 of the LTE-U eNB, UE2 does not experience interference (or more specifically, wireless communications between UE2 and the LTE-U eNB do not experience interference) from another wireless access network node (e.g. another AP).
  • UE3 is in the coverage areas 202 and 206 of both the LTE-U eNB and AP2, UE3 does not experience interference due to communications AP2 since the LTE-U eNB and AP2 use different channels (channel X and channel Y).
  • UE1 can experience interference (or more specifically, wireless communications between UE1 and the LTE-U eNB can experience interference) on channel X due to the operation of AP1.
  • any WLAN devices connected to AP1 and AP1 itself may experience interference due to the communications between UE1 and the LTE-U eNB.
  • LTE-U eNBs Conventionally, effective channel selection mechanisms are not provided with LTE-U eNBs to address interference issues of UEs (served by the LTE-U eNBs) due to operations of proximate APs or other wireless access network nodes.
  • Channel selection by an LTE-U eNB can refer to selection of one or more channels in an unlicensed spectrum to use for communications with a UE served by the LTE-U eNB.
  • Traditional channel selection mechanisms do not consider presence of primary use entities or the other entities in channels of the unlicensed spectrum, whether certain channels of the unlicensed spectrum are being used by Radar or UEs for certain purposes based on user preference, such as Wi-Fi communications (e.g. enterprise Wi-Fi or home Wi-Fi), and/or other considerations.
  • Wi-Fi communications e.g. enterprise Wi-Fi or home Wi-Fi
  • channel selection and bandwidth adjustment are performed independently by each of multiple systems (e.g. LTE-U eNBs and APs) sharing a common frequency band, then knowledge from those other system(s) cannot be taken into account in a preemptive manner. That is, a system can only react to the channel and bandwidth choices of other systems based on, for example, measurements of the interference observed. Such a scheme is referred to here as "reactive coordination.”
  • an LTE-U eNB receives (at 302) assistance information from a UE, where the assistance information includes information indicating one or more channels of an unlicensed spectrum to use or avoid.
  • the assistance information can also include other information.
  • the assistance information can be received from another network entity besides a UE, such as another wireless access network node.
  • the LTE-U eNB selects (at 304) at least one channel of the unlicensed spectrum for communicating data of the UE.
  • Channel selection can refer to picking or choosing a specific channel or multiple channels (the best channel(s) according to some criterion or criteria) to use for operation.
  • Channel selection can also be performed as part of bandwidth adjustment, which refers to a selection of a plurality of channels to use, such as the number of channels for component carriers of a CA or dual connectivity.
  • any or some combination of the following assistance information can be reported from the UE to an LTE-U eNB to assist the LTE-U eNB in selection of channels for LTE-U operation.
  • the UE may report the most preferred channels in the order of preference considering one or more criteria described above.
  • the UE may report the least preferred channels in the order of undesirableness considering one or more criteria described above.
  • an LTE-U SCell an SCell provided on a channel of an unlicensed spectrum
  • the UE may report the quality of the SCell channel to the LTE-U eNB using Channel Quality Indicator reporting mechanisms or procedures.
  • a channel quality report (including a CQI) may be sent to the LTE-U eNB via a licensed channel (i.e. the PCell on a licensed channel).
  • a wideband channel quality report may be sent by the UE in an SCell on an unlicensed channel, to report the channel quality on a given SCell channel.
  • the channel quality reports may be sent on the SCell or the licensed PCell (which will ensure these reports are received by the eNB even when the SCell is unavailable for UL transmissions).
  • a CQI can indicate the channel quality in downlink that is estimated by the UE.
  • the UE may transmit CQI index value (or codepoint) 0 (out of range) concerning the SCell associated with LTE-U operation or an unlicensed spectrum in response to the UE detecting a problem. For example the UE may detect signal relating to Radar operation over the unlicensed channel, when DFS (discussed further above) is used to avoid any channel in which Radar operation is present. In some examples, the UE can determine whether Radar detection is to be performed in a given SCell on an unlicensed channel based on the Registered PLMN (RPLMN) country code and the channel number.
  • RPLMN Registered PLMN
  • the UE may transmit CQI index value (or codepoint) 0 (out of range) concerning the SCell associated with LTE-U operation or an unlicensed spectrum when the UE detects in response to the UE detecting strong interference or an increased packet error rate that exceeds a specified threshold.
  • the LTE-U eNB may suspend the use of a given channel (of the unlicensed spectrum) on which the LTE-U SCell is provided, for a specified time period, which is configurable.
  • the LTE-U eNB may decide to stop utilizing the given channel by releasing the SCell(s) using the given channel from the UEs.
  • the LTE-U eNB may simply not schedule any data and refrain from transmitting any signals over the given channel of the unlicensed spectrum until the reception of the UE report indicating that the channel is improved.
  • the LTE-U eNB can provide an uplink grant in a PCell to the UE, where the uplink grant grants use of an UL resource to the UE to perform communications of information to the LTE-U eNB.
  • the UE may report additional information in a message in the granted UL resource, where the message can include a Medium Access Control (MAC) control element (CE) or a UE assistance information Radio Resource Control (RRC) message (both discussed further below).
  • MAC Medium Access Control
  • CE control element
  • RRC Radio Resource Control
  • CQI index values can be reported to indicate different conditions.
  • additional CQI index values can be provided in accordance with the present disclosure. More specifically, in addition to CQI index values 0-15 provided by 3GPP TS 36.213, further CQI index values can be defined to indicate other conditions, including any or some combination of the following conditions:
  • Conditions (1)-(4) above can be identified by respective new CQI index values (or codepoints) 16-19 specified in the following example table, where the new CQI index values are in addition to CQI index values defined by 3GPP TS 36.213 Table 7.2.3-1: 5-bit CQI Table CQI index modulation code rate x 1024 efficiency 0 out of range 1 QPSK 78 0.1523 2 QPSK 120 0.2344 3 QPSK 193 0.3770 4 QPSK 308 0.6016 5 QPSK 449 0.8770 6 QPSK 602 1.1758 7 16QAM 378 1.4766 8 16QAM 490 1.9141 9 16QAM 616 2.4063 10 64QAM 466 2.7305 11 64QAM 567 3.3223 12 64QAM 666 3.9023 13 64QAM 772 4.5234 14 64QAM 873 5.1152 15 64QAM 948 5.5547 16 Out of range Strong interference from an IEEE 802.11 source 17 Out of range IEEE 802.11 beacon frames detected in the channel 18 Out of range Presence
  • the LTE-U eNB may take appropriate action to either choose an appropriate modulation and coding scheme (MCS) (when a reported CQI index value is in the range of 1-15) or as follows (when a reported CQI index value is other than 1-15):
  • MCS modulation and coding scheme
  • the LTE-U eNB may assume that the specific channel (in the unlicensed spectrum) is available for DL transmissions. In this case, the LTE-U eNB can schedule DL data either with or without transmitting Clear to Send (CTS) in the specific channel to UEs.
  • CTS Clear to Send
  • transmission of CTS ahead of data transmission can be used when the LTE-U eNB detects a possibility of a collision (and has chosen to occupy the channel for a longer period of time, e.g. more than 1 transmission time interval or TTI).
  • TTI transmission time interval
  • the LTE-U eNB may assume presence of a clear SCell channel and hence can start using the channel for DL transmissions to the UEs without transmitting CTS.
  • channel sensing is also done at the eNB side (prior to transmission) and the decision of using the channel with or without CTS may also depend on whether the eNB detects any presence of interference or high packet error rate in the SCell channel.
  • a UE may report any information related to the channel quality of the SCell channel in a new Medium Access Control Protocol Control Element, MAC CE or in a UE assistance information RRC message.
  • the UE may first trigger CQI out of range report (e.g. indicate CQI index value 0) concerning an SCell configured over unlicensed spectrum to obtain an uplink grant to transmit the MAC CE or UE assistance information RRC message in a granted UL resource to the LTE-U eNB.
  • the UE can send a Buffer Status Report (BSR) over the licensed spectrum or PCell to obtain the uplink grant.
  • BSR Buffer Status Report
  • the LTE-U eNB When the LTE-U eNB receives a CQI out of range report concerning an SCell on an unlicensed channel, or receives a BSR including the logical channel group with signaling radio bearer 1 (SRB1), the LTE-U eNB can grant an UL resource by sending a Physical Downlink Control Channel (PDCCH) grant over the PCell to the UE. The UE can then report the channel problem in the MAC CE or RRC message.
  • PDCCH Physical Downlink Control Channel
  • the MAC CE 400 includes multiple entries 402, where each entry 402 has the following values:
  • UE assistance information can be reported in a new information element of an RRC message, such as the UEAssistancelnformation RRC message as shown below.
  • the UE assistance information is the UEAssistancelnformation RRC message can carry more information than a MAC CE.
  • the UEAssistancelnformation RRC message can provide a list of channels that are not available due to these being used for purposes other than LTE-U, e.g. for Wi-Fi. This may be in the form of a reserved channel list (reservedLAAChannelList) so that the LTE-U eNB may avoid requesting measurement of or assigning these channels for LTE-U operation.
  • reservedLAAChannelList reserved channel list
  • the UE may report an index that identifies the channel and the reason e.g. Wi-Fi usage, etc.
  • a list of most preferred channels IaaMostPreferredChannelList
  • least preferred channels laaLeastPreferredChannelList
  • detected WLAN APs (detectedWIanAPsList that provides a list of detected WLAN APs detected by a UE) and detected LTE-U eNBs (detectedLAAeNBsList that provides a list of LTE-U eNBs detected by a UE).
  • detected WLAN APs (detectedWIanAPsList that provides a list of detected WLAN APs detected by a UE)
  • detected LTE-U eNBsList (detectedLAAeNBsList that provides a list of LTE-U eNBs detected by a UE).
  • the UEAssistancelnformation RRC message can also indicate presence of a detected primary use entity in primaryUserDetected.
  • the location of the reporting UE can be specified in UELocation.
  • a WLAN mobile device may send a message having similar content to a WLAN AP to which the WLAN mobile device attaches to report conditions of channels being utilized for LTE-U operation in order to avoid the WLAN AP using the channels in communications with the WLAN mobile device.
  • an InDeviceCoexIndication RRC message (used for reporting in-device coexistence interference between transceivers of different technologies in a UE, such as an LTE transceiver and a WLAN transceiver) can be extended to include at least one of reservedLAAChannelList, LaaMostPreferredChannelList and LaaLeastPreferredChannelList.
  • the UE is allowed to transmit the InDeviceCoexIndication to the eNB only if the eNB configures to UE to send these indications.
  • the UE may autonomously transmit the InDeviceCoexIndication to the eNB without any explicit configuration enabling the InDeviceCoexIndication message transmissions.
  • the eNBs supporting LAA may be mandated to understand and receive InDeviceCoexIndications from the UE.
  • the InDeviceCoexIndicaiton message may further be extended to provide further information regarding the SCell quality and also to provide a preferred channel list or channel list to avoid, etc., as mentioned above. Further, the InDeviceCoexIndication message may also indicate presence of the primary use entities in the unlicensed spectrum.
  • the UE may be allowed to use mechanisms such as autonomous denial of reception or transmission of LTE data without being explicitly configured by the eNB to do so.
  • Such mechanisms of autonomous denial may be adopted by the UE to comply with regulatory requirements for instance when a primary use entity signal is detected within the operating channel.
  • the UE may be restricted to adopt such unconfigured autonomous denial mechanisms only if a primary use entity is detected. By adopting such mechanism, the UE refrains from transmitting on an operating channel despite receiving any explicit grant or command from the eNB to transmit data on the channel.
  • the UE in response to receiving any indication or grant to transmit on a channel, the UE, upon detecting the presence of a primary use entity in the channel, may trigger transmission of an InDeviceCoexIndication message and schedule it to be transmitted only on the licensed spectrum to indicate the reason for autonomous denial.
  • the eNB may refrain from using the channel and adopt mechanisms for DFS upon receiving any indication of presence of primary use entity from the UE.
  • a UE can be configured to perform channel measurements and to report information based on the channel measurements to an eNB.
  • a UE 501 can perform an RRC connection establishment procedure (at 502) with a PCell provided by an eNB.
  • the RRC connection establishment procedure establishes an RRC connection between the PCell 500 and the UE 501.
  • a measurement configuration setup can be provided, which supports measurements of channels in the licensed spectrum as well as in the unlicensed spectrum.
  • the RRC connection reconfiguration procedure involves the eNB sending (at 503) an RRC Connection Reconfiguration message to perform measurement setup), and the UE 501 responding (at 504) with an RRC Connection Reconfiguration Complete message.
  • the RRC Connection Reconfiguration message is sent by the eNB to configure measurement of one or more channels of the unlicensed spectrum.
  • the UE 501 can respond with a response accepting or rejecting measurement of the channel(s).
  • the RRC Connection Reconfiguration Complete message (504) is used to accept measurement of the channel(s).
  • the measurement configuration defined by RRC can be applied to the channels of the unlicensed spectrum.
  • the UE 501 can perform (at 505) channel measurements of channels indicated in the measurement configuration, where the channels can be part of the licensed spectrum and an unlicensed spectrum. If the UE 501 is utilizing a given channel for other purposes (e.g. used for Wi-Fi, which renders the given channel unavailable for LTE-U measurement), or the given channel is one of the least preferred channels, then the UE 501 may indicate in the RRC Connection Reconfiguration Complete message (504) to the eNB that a corresponding measurement object for the given channel has not been configured.
  • the UE 501 can also include a cause or reason field in the message, where the cause or reason field can indicate, for example, "in-use by Wi-Fi" or "strong interference.”
  • the message can be in an RRC Connection Reconfiguration Complete message, for example.
  • the UE 501 can perform channel measurements of the given channel. Events can be triggered in response to various criteria. For example, a first event can be triggered in response to an unlicensed channel (in an unlicensed spectrum) having a strength greater than a specified threshold. Upon detecting (at 506) a triggered event (e.g. the first event noted above), the UE 501 sends (at 508) a measurement report to the eNB.
  • a triggered event e.g. the first event noted above
  • the measurement report can include any or some combination of the following information:
  • event In addition to the foregoing event (first event), other events can also be defined, including any of the following events:
  • the UE 501 can send (at 508) a measurement report.
  • the measurement report can include Beacon frame information of a new WLAN or PLMN ID or other information available about a new LTE-U eNB, where appropriate.
  • the measurement report may include any information related to the WLAN network's carrier usage. Examples of this include information such as the primary channel frequency of the detected WLAN cell and information related to any secondary channels used by the WLAN AP when bandwidths larger than 20 MHz are in use for the detected WLAN AP.
  • a measurement gap can be configured by an eNB for the UE.
  • a measurement gap refers to a time interval during which no transmissions or receptions with respect to the UE occur.
  • the UE can perform measurements during the measurement gap to detect WLAN APs.
  • the UE can utilize the discontinuous reception (DRX) off duration (when the receiver of the UE is turned off for power savings) to perform detection of WLAN APs.
  • DRX discontinuous reception
  • the LTE-U eNB may stop scheduling DL transmissions on the given channel.
  • the LTE-U eNB can transmit a new "abort transmission" MAC CE to a new group radio network temporary identifier (RNTI) in the PCell to stop ongoing uplink transmissions (which include retransmissions) by the UE.
  • RNTI radio network temporary identifier
  • An example of an "abort transmission" MAC CE 600 is shown in Fig. 6 .
  • the "abort transmission" MAC CE 600 include an index 602 identifying a channel on which UEs should abort UL transmissions.
  • the "abort transmission" indication may be also delivered via RRC signaling.
  • the eNB can decide to add an LTE-U SCell (an SCell on an unlicensed channel), by sending (at 510) an RRC Connection Reconfiguration message to add one or more LTE-U SCells.
  • the UE 501 can partially accept or explicitly reject some of the indicated LTE-U SCells in the RRC Connection Reconfiguration message.
  • the UE may base a decision to reject a given LTE-U SCell based on the UE's preference regarding unlicensed channels or other considerations such as potential interference situation, hardware restriction, the channel being used by Wi-Fi, etc.
  • the LTE-U eNB may request to add multiple SCells over unlicensed channels and the UE may accept all of the unlicensed channels, or just some of the unlicensed channels, or reject some of the unlicensed channels, based on the information the UE has concerning Wi-Fi traffic or primary use entity operation in respective unlicensed channel(s).
  • the UE may base the decision (for example for a specific band, sub-band, or channel) because the specific band, sub-band, or channel is being utilized locally by the UE for other operations such as Wi-Fi.
  • the requested unlicensed channel may be one that is locally utilized by the UE for another purpose, or one that cannot be utilized due to the UE's hardware restrictions with regards to other channels in use for other operations.
  • the UE can send (at 512) an RRC Connection Reconfiguration Complete message that may include a list of SCells that have or have not been added along with the associated cause or reason (e.g. Radar operation has been detected on a specific channel, or one or more interfering WLAN APs or LTE-eNBs have been detected, or a number of detected WLAN APs or LTE-U eNBs is higher than a threshold, or the UE is using the specific channel for another operation of another radio technology, such as Wi-Fi), or the specific channel is not available due to the usage of another channel for another operation of another radio technology.
  • the same cause or reason can be applicable to RRC connection reconfiguration complete message, reply to RRC connection reconfiguration message requesting measurement configuration.
  • a frequency region can refer to a range of frequencies that share similar requirements.
  • An example of a frequency region is the 5-GHz frequency region (shown in Fig. 7 ) that includes the spectrum of 5,150 MHz - 5,925 MHz.
  • a part of the 5-GHz frequency range or the entire 5-GHz frequency range may be an unlicensed spectrum depending on the country.
  • the 5-GHz frequency region or other unlicensed frequency region in which LTE-U is available may be defined so that the unlicensed frequency region is globally identifiable.
  • a frequency band (or more simply a "band") can refer to a subdivision of a frequency region.
  • six frequency bands 700-1, 700-2, 700-3, 700-4, 700-5, and 700-6 can be defined in the 5-GHz frequency region to accommodate current allocations in Europe and the United States, for example.
  • a different number of bands can be defined in the 5GHz band or another unlicensed band.
  • the frequency band 700-1 is in the range of 5,150 MHz-5,250 MHz.
  • Each frequency band can in turn be sub-divided into channels.
  • a channel can be the smallest addressable division of a frequency band, addressed by a channel identifier.
  • channel identifiers can be in the form of E-UTRA Absolute Radio Frequency Channel Numbers (EARFCNs), which may be assigned to respective LTE-U channels.
  • E-UTRA Absolute Radio Frequency Channel Numbers (EARFCNs)
  • LTE-U channels may be identified by indexes.
  • WLAN channel numbers may be used to identify channels in other examples.
  • mobile communications networks can use a 20-MHz channel, which can be utilized by multiple network operators.
  • the lower 15-MHz portion of the 20-MHz channel can be used for operator A, while the upper 5-MHz portion of the 20-MHz channel can be used for operator B.
  • two channel portion indexes or identities are used to indicate or identify the center frequencies of the two portions of the 20-MHz channel.
  • the channel portion indexes are different from the WLAN channel numbers, and can be used for LTE-U operation.
  • the center frequency of the lower 15-MHz portion is 5,257.5 MHz
  • the center frequency of the upper 5-MHz portion is 5,267.5 MHz.
  • a first channel portion index can be used to indicate the lower 15-MHz portion
  • a second channel portion index can be used to indicate the upper 5-MHz portion.
  • a band combination refers to a collection of frequency bands that can be used for communications between an eNB and a UE.
  • a band combination can include one or more licensed frequencies and zero or more unlicensed frequencies. The full set of band combinations (permutations of licensed plus unlicensed frequencies) may be large.
  • the LTE-U eNB may indicate a set of licensed and unlicensed bands and requests the UE to report the band combinations (including the indicated bands only) that the UE can support.
  • the UE signals its support of licensed and unlicensed bands. For the supported combinations of unlicensed and licensed bands, different options exist for how the UE can signal supported/unsupported combinations:
  • the UE may initially report only band combinations of licensed bands. Subsequently, if the LTE-U eNB wants to utilize the unlicensed spectrum, the LTE-U eNB can request from the UE its supported band combination information for a specific list of licensed bands currently utilized as PCell and unlicensed bands which can be used with the combinations with the band currently utilized as PCell.
  • Another UE capability indication can indicate whether the hardware in the UE supporting the operation in the unlicensed band is for exclusive support of LTE-U or WLAN operation. That is, in the case where the UE has just a single radio transceiver (RF communications), if parts of the UE radio functionality (to support unlicensed operation) are common or shared by both WLAN and LTE-U technologies, the user's preference for one of the technologies versus the other may be used to govern which takes precedence. For example, the user preference (stored in the UE, for example) may specify that the presence of a WLAN connection will prohibit LTE-U operation, or vice versa.
  • the two radio transceivers operating in either the same or different unlicensed bands can in theory support both LTE-U and WLAN operations simultaneously, thus not causing any interruption of the LTE-U operation even if a WLAN connection is present.
  • the UE can report a subset of band combinations that are impacted or otherwise unavailable due to WLAN usage.
  • the UE can simply indicate whether the UE possesses only a single radio transceiver operable in the unlicensed bands, or more than one radio transceiver. In the case that a single radio transceiver is indicated, this informs the eNB of the possibility that a user preference for normal WLAN operation can prohibit the device from LTE-U operation. Should the UE indicate that it possesses two (or more) radio transceivers operable in the unlicensed bands, further additional information may be provided to the eNB regarding how (and under which conditions) these radio transceivers can operate simultaneously.
  • the UE can signal additional UE capabilities, including the following, for example:
  • support for (b) implies also support for (a) and support for (c) implies also support for (a) and (b).
  • a wireless access network node receives, from the UE, information indicating support or lack of support for simultaneous WLAN operation and LTE-U operation.
  • the wireless access network node can use the received information to select at least one channel of the unlicensed spectrum for communicating data of the UE.
  • a UE may dynamically provide, in various messages (such as channel quality reports, MAC CEs, UE Assistance Information RRC messages), lists of channels that may include one or more of the channels being used for WLAN operation, and/or channels that cannot be utilized for LTE-U due to the usage of other technologies (in light of UE hardware restrictions), and/or other information.
  • the UE capability signalling outlined in 1) and 2) above allows the UE to provide up-front information to the eNB related to its RF architecture and its capabilities to support simultaneous WLAN and LTE-U operations. By doing so, this may then obviate or lessen having to perform regular reporting as discussed further above.
  • a UE detects a problem condition related to a wireless channel in an unlicensed spectrum, and transmits an indication indicating the problem condition to a wireless access network node.
  • the indication indicates the problem condition is transmitted on a wireless channel in a licensed spectrum.
  • the problem condition relates to detection of one or more of the following conditions: detection of a presence of a primary use entity on the wireless channel, and detection of a presence of another interference source on the wireless channel.
  • the UE refrains from transmitting on the wireless channel subsequent to detecting the problem condition.
  • the indication indicating the problem condition is included in a message selected from at least: a Channel Quality Indicator (CQI) message, a UE assistance information message, and an IndeviceCoexIndication message.
  • CQI Channel Quality Indicator
  • UE assistance information message e.g., a UE assistance information message
  • IndeviceCoexIndication message e.g., a UE assistance information message
  • the UE sends, to the wireless access network node, information regarding combinations of frequency bands in the unlicensed spectrum and in the licensed spectrum not supported by the UE.
  • a first wireless access network node In response to an indicator of the problem concerning a secondary cell, a first wireless access network node performs an action selected from among: ceasing utilization of the first channel, configuring another channel in the unlicensed spectrum for use by the UE, or coordinating usage of the first channel with a neighbor wireless access network node.
  • the indicator in a channel quality report includes a Channel Quality Indicator (CQI) index set to a specific value, and the CQI index is settable to other values indicating that the first channel is available for communication of data.
  • CQI Channel Quality Indicator
  • data is transmitted over the first channel with or without transmitting a Clear to Send (CTS), where transmission of the CTS is performed responsive to the wireless access network node detecting a possible collision with transmission from another source.
  • CTS Clear to Send
  • MAC Medium Access Control
  • CE control element
  • RRC Radio Resource Control
  • a wireless access network node receives, from the UE, a Channel Quality Indicator (CQI) set to out of range or a Buffer Status Report (BSR). Responsive to the CQI out of range report or BSR, the wireless access network node sends an uplink grant to the UE, the uplink grant providing an uplink resource for the UE to send the assistance information in the MAC CE or RRC message.
  • CQI Channel Quality Indicator
  • BSR Buffer Status Report
  • the wireless access network node receives, from the UE, information regarding frequency bands in the unlicensed spectrum and in a licensed spectrum supported by the UE.
  • the wireless access network node receives, from the UE, information regarding combinations of frequency bands in the unlicensed spectrum and in the licensed spectrum not supported by the UE.
  • the wireless access network node receives, from the UE, information specifying a number of bands that the UE can support simultaneously.
  • the wireless access network node chooses a combination of frequency bands to use to avoid in-device coexistence interference.
  • the received information is responsive to information sent by the wireless access network node to the UE identifying one or more of frequency bands in licensed spectrum and frequency bands in the unlicensed spectrum.
  • wireless access network nodes can communicate information to each other.
  • an LTE-U eNB can receive certain information from a WLAN AP or another LTE-U eNB.
  • the exchange of information can include intra-physical node communications, in examples where a physical node implements wireless access functionalities for different radio access technologies (e.g. LTE and WLAN).
  • a physical node can include an LTE-U eNB and a WLAN AP (which in this case are considered logical wireless access network nodes implemented on a physical node).
  • the exchange of information can also include inter-physical node communications between different physical nodes (e.g. an LTE-U eNB and a WLAN AP).
  • different physical nodes e.g. an LTE-U eNB and a WLAN AP.
  • any or some combination of the following information can be exchanged between wireless access network nodes using intra-physical node communications or inter-physical node communications, for assisting in the selection of best channel(s) or for bandwidth adjustment.
  • a wireless access network node e.g. LTE-U eNB or WLAN AP
  • the following information can be exchanged:
  • Fig. 8 shows an example arrangement of wireless access network nodes, including an LTE-U eNB 802 and a WLAN AP 804.
  • the LTE-U eNB 802 provides a physical node that includes both an eNB functionality 806 and a WLAN AP functionality 808.
  • the eNB functionality 806 can be referred to as an eNB, while the WLAN functionality 808 can be referred to as a WLAN AP.
  • Communications between the eNB 806 and WLAN AP 808 are intra-physical node communications.
  • Information collected by the WLAN AP 808, e.g. Wi-Fi related information (such as discussed above) may be provided to the eNB 806 for use in channel selection of channels for LTE-U operations.
  • LTE-U eNB information such as the LTE-U related information discussed above may be provided to the WLAN AP 808 for use in WLAN AP channel selection.
  • Fig. 8 also shows another WLAN AP 804 that is on a physical node that is separate from the physical node implementing the LTE-U eNB 802.
  • the physical node on which the WLAN AP 804 is located may also include an eNB, in some examples.
  • the WLAN AP 804 may be a standalone physical node.
  • the LTE-U eNBs and WLAN APs in proximity to each other can exchange information over the air (810), where the exchanged information is useful for selecting a channel and bandwidth adjustment.
  • the over the air interface is a wireless interface and can include an X2 interface, a PC5 interface, or another interface.
  • An X2 interface is an interface between eNBs.
  • a PC5 interface is used as part of a proximity service (ProSe) as provided by 3GPP TS 23.303, which allows for proximate UEs to discover each other and to communicate each other directly.
  • ProSe proximity discovery can be used to allow wireless access network nodes (e.g. LTE-U eNBs and WLAN APs) to discover each other so that they can exchange information with each other to assist in channel selection in an unlicensed spectrum.
  • the LTE-U eNB 802 can utilize ProSe direct discovery to identify another LTE-U eNB or WLAN APs in proximity, if the other LTE-U eNB or WLAN AP also supports ProSe. As shown in Fig. 8 , the LTE-U eNB 802 includes a ProSe application 812 and the WLAN AP 804 similarly includes a ProSe application 814, so that the LTE-U eNB 802 and the WLAN AP 804 can perform ProSe direct discovery.
  • ProSe direct communication can be used to exchange information between the wireless access network nodes to assist in channel selection.
  • the advantage of using direct discovery and communication is to avoid having to configure inter-node interfaces such as the X2 interface.
  • the nodes involved in LTE-U operation may be pre-authorized and preprovisioned by an Operation & Maintenance (O&M) system to perform ProSe discovery and communication only for LTE-U information exchange purposes so that the authorization and provisioning tasks of the ProSe procedure can be skipped.
  • O&M Operation & Maintenance
  • Model A is for announcing ("I am here") and Model B is for solicitation ("who is there?").
  • Model A an announcing wireless access network node transmits a discovery message to the PC5 interface, and a monitoring wireless access network node receives the discovery message through the PC5 interface.
  • the announcing wireless access network node is configured with an allowed range (a list of range classes), which is translated into a transmission power of the discovery message.
  • the monitoring wireless access network node can perform a match report procedure to authenticate the received discovery message.
  • the announcing wireless access network node and the monitoring wireless access network node can set up a direct communication channel to exchange information (as discussed above) to assist in channel selection. Note that the wireless access network nodes can perform the discovery and communication repeatedly to keep the information up to date.
  • Model B when a first wireless access network node starts up, the first wireless access network node may start the model B discovery (who is there?).
  • a neighbor wireless access network node that received the discovery message (over the PC5 interface) may reply to the first wireless access network node and provides the neighbor wireless access network node's layer 2 source address for subsequent direct communication for exchanging the information described above.
  • a ProSe function 816 within a ProSe application server 818 can also be present in the core network to support ProSe direct discovery between wireless access network nodes.
  • the LTE-U eNB 802 can exchange Wi-Fi related information collected from its band scan of the supported channels, its built-in WLAN AP 808, or the assistance information reported from UEs with the other ProSe-enabled node, for example LTE-U eNB.
  • the direct discovery or communication for the inter-physical node coordination may be conducted over licensed or unlicensed channels.
  • ProSe discovery and communication for LTE-U inter-physical node coordination over the unlicensed channels may have advantage over ProSe discovery and communication over licensed channels due to the following:
  • the allowed range of the discovery message can be appropriately configured depending on LTE-U operation frequencies, e.g. 2.4-GHz band or 5-GHz band.
  • a first wireless access network node includes a communication interface to wirelessly receive, from a second wireless access network node, information relating to the second wireless access network node. At least one processor in the first wireless access network node selects, based on the received information, at least one channel in an unlicensed spectrum.
  • the ProSe discovery parameters include a ProSe application ID and an allowed range.
  • the ProSe application ID (as described in 3GPP TS 23.303) can be defined for:
  • the allowed range is another ProSe discovery parameter that can be defined.
  • the allowed range is a list of range classes, which is translated into the transmission power of a discovery message.
  • the allowed range can be defined for:
  • the ProSe direct communication parameters can include a ProSe UE ID and a ProSe Layer 2 Group ID.
  • the ProSe UE ID is a link layer identifier assigned by A ProSe Key Management Function as defined in 3GPP TS 33.303, where the ProSe UE ID uniquely represents the UE in the context of one-to-many ProSe direct communication for a group.
  • the ProSe UE ID is used as a source layer 2 ID in packets the UE sends for one-to-many ProSe direct communication.
  • the ProSe UE ID can be set to a layer 2 ID of a wireless access network node.
  • the ProSe Layer 2 Group ID is a link layer identifier that identifies the group in the context of one-to-many ProSe direct communication.
  • the ProSe Layer 2 Group ID is used as a destination Layer 2 ID in packets a UE sends to this group for one-to-many ProSe direct communication.
  • the ProSe Layer 2 Group ID can be set to the layer 2 of the node group.
  • Some examples include:
  • one-to-one direct communication may be used between the two wireless access network nodes in proximity.
  • One wireless network access node may be assigned with the first ProSe UE identifier and another wireless access network node may be assigned with the second ProSe UE identifier.
  • the first node transmits the information relating to the first node to the second ProSe UE identifier and the second node sends the information relating to the second node to the first ProSe UE identifier to exchange the information for channel selection.
  • ProSe Layer 2 Group Id may be assigned to neighbor LTE-U eNBs.
  • LTE-U eNBs can exchange the channel status (i.e. status of the channels configured as SCells) over the X2 or other interface. This ensures that the LTE-U eNBs have an idea of the channel distribution among neighboring LTE-U eNBs to avoid the interference with each other.
  • eNB1 sends (at 902) to eNB2 information regarding the channels that eNB1 has currently configured as LTE-U SCells.
  • eNB2 can choose the remaining channels as its own LTE-U SCells, and sends (at 904) to eNB1, information indicating the channels that eNB2 has currently configured as LTE-U SCells.
  • eNB1 and eNB2 can use the indicated channels to transmit (at 906, 908, respectively) data to UEs in the unlicensed spectrum within the respective coverage areas of eNB1 and eNB2.
  • Fig. 10 is a block diagram of a wireless node 1000 according to some examples, which can be a wireless access network node (e.g. eNB or WLAN AP) or a UE.
  • the wireless node 1000 includes a processor (or multiple processors) 1002 that is coupled to a communication interface 1004 (for communicating with another node or over the air with a UE).
  • a processor can include a microprocessor, a microcontroller, a programmable integrated circuit, a programmable gate array, and so forth.
  • the processor(s) 1002 can also be coupled to a non-transitory machine-readable or computer-readable storage medium 1006 storing machine-readable instructions 1008 that are executable by the processor(s) 1002 to perform any of the various tasks of wireless access network nodes or UEs discussed above.
  • the storage medium (or storage media) 1006 can include one or multiple different forms of memory including semiconductor memory devices such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs) and flash memories; magnetic disks such as fixed, floppy and removable disks; other magnetic media including tape; optical media such as compact disks (CDs) or digital video disks (DVDs); or other types of storage devices.
  • semiconductor memory devices such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs) and flash memories
  • magnetic disks such as fixed, floppy and removable disks
  • optical media such as compact disks (CDs) or digital video disks (DVDs); or other types of storage devices.
  • CDs compact disks
  • DVDs digital
  • Such computer-readable or machine-readable storage medium or media is (are) considered to be part of an article (or article of manufacture).
  • An article or article of manufacture can refer to any manufactured single component or multiple components.
  • the storage medium or media can be located either in the machine running the machine-readable instructions, or located at a remote site from which machine-readable instructions can be downloaded over a network for execution.

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CA2972917A1 (fr) 2016-08-04
CA2972917C (fr) 2022-07-12
EP3210407A1 (fr) 2017-08-30
ES2955195T3 (es) 2023-11-29
EP3813405B1 (fr) 2023-08-09
US10397794B2 (en) 2019-08-27
US20160227416A1 (en) 2016-08-04
WO2016123247A1 (fr) 2016-08-04
EP3210407B1 (fr) 2021-03-10
EP3813405C0 (fr) 2023-08-09

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